If you divorce your wife during a period of purity in which you had had intercourse with her, this talaq is not valid in Islam. For more, please see the detailed answer.

• A woman does not have the power to divorce her husband; rather divorce is in the hand of the man. The husband is not obliged to seek the permission or approval of his wife if he wants to take a second wife. • If it so happens that a woman cannot put up with her husband’s taking a second wife and she fears that she will not be able to fulfil her husband’s rights over her, then she may request Khul ` and return the dowry to the husband.